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An example of using a viewshed analysis on a line segment is from the Wyoming State Office, Bureau of Land Management, in which the office used a viewshed analysis to determine the visibility from National Historic Trails across Wyoming. Within the Rock Springs Field Office area there are five different viewsheds to choose from.
In baseball, to lead off, or to take a lead, refers to the position a baserunner takes just prior to a pitch, a short distance away from the base the player occupies. [2] A "lead" can also refer to that distance. [2] A typical lead is six to ten feet (two to three meters) from the base. If the lead is too large, the runner risks being picked off.
In geometry, visibility is a mathematical abstraction of the real-life notion of visibility. Given a set of obstacles in the Euclidean space , two points in the space are said to be visible to each other, if the line segment that joins them does not intersect any obstacles.
The international definition of fog is a visibility of less than 1 km (3,300 ft); mist is a visibility of between 1 km (0.62 mi) and 2 km (1.2 mi) and haze from 2 km (1.2 mi) to 5 km (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size.
Visibility graphs may be used to find Euclidean shortest paths among a set of polygonal obstacles in the plane: the shortest path between two obstacles follows straight line segments except at the vertices of the obstacles, where it may turn, so the Euclidean shortest path is the shortest path in a visibility graph that has as its nodes the start and destination points and the vertices of the ...
Geopositioning yields a set of geographic coordinates (such as latitude and longitude) in a given map datum. Geographic positions may also be expressed indirectly, as a distance in linear referencing or as a bearing and range from a known landmark. In turn, positions can determine a meaningful location, such as a street address.
In baseball and softball, while there are nine named fielding positions, players, with the exception of the pitcher and catcher, may move around freely. The positioning for the other seven positions is very flexible, although they all have regular depths —distances from home plate , and sometimes lateral positioning.
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